Dental-plate swage.



' Fo all t mayl con/cern,.-

GRANT E. imminenti, or BELFAST; NEWv if'onir;

i i DENTAn-Pl- A'TE SWAGE; i

Specication'of Letters Patent.

Annuario sied May i, 1905. serai No. 258.177.

Be it known that I, ,GRANT E. FREEBORN, a citizen of the United States, and a resident of Belfast,V in the countyofAllegany and State.

of New York, have invented new and useful ,Improvements in y:Dental-Plate Swages, of

` which the following, taken in connection with v the accompanying drawings, is afull, clear,

andexact description.

The invention relates to appliances for shaping sheet-metal dental plates; and the objects'` of my improvementare, first, to provide a simple form of swage whichy is divided on aline with the die and can'be opened-for inspection at any stage of the operation Without detriment to the plate 'andinwhich the plate and particularly theunder-cuts of the plate are accessible for malleting, and,`second, to provide means for preventing leakagev un` der the heavy pressure vnecessitated in swaging sheet metal over a die.

In the drawings, Figure 1 is asectiona'l view of the swage at line X X in'Fig' 2 and showing a plate in the process of swaging.- Fig. 2 is a plan view lof the swage, showing the retaining-ring and die in dotted line.. Fig. 3 is a side elevation of one of the, end clamps. Fig. 4 is a sectional view of a modi-A fication of the swage -without the inner ring.

lSimilarj numerals Irefer tol corresponding parts in theseveral views..

The base of the swageis divided on aline with the plate-die. The twoparts ofthe base are indicated'by the numeralsrl() and 1 1. The upper part' 10 sets on the lower part 11 with a ground joint 12. For light plates the ground joint l2issuiiicient to prevent leakage, and-the simple divided base, as shown in the modification in Fig; 4, would be sucient for such work; but vfor heavy plates I prefer the insertion of an inner ring 14. Ring 14 is made to it lightlywithin top part 10, so that in opening the swageit remains in place. A seat 13 is made in lower part 11 forthe lower edge of ring 14,; said seat having a slight vent extending up to the joint 12 in order that the rin 14 may beeasily removed in opening the mo d and so that the ring will also instantly seek its place in putting the two together. The upper edge 15 also has a close joint. It is apparent that the ring 14 will provide joints 13 and 15 in addition to the groundv j oint 1 2 and in front of said joint and between thedie and the joint, thus absolutely preventing all liability'to leakage, yet-allowing of the easy opening of the swage.

Vertically-opposite lugs 16 and 17 are provided on parts 10 and 1 1 to receive the clamps 18, which clamps are preferably operatedby a screw 19. Upper lugs 16 have slight depressions 20 to receive the lower endof screw 19, so that'the clamp will always come to the correct position in compressing the parts. Clamps 18 `are also set'close to the main body of parts 10 and 11,v Aas shown at 21 in Fig. 2, so

as to hold the parts firmlyinplace and pre#` vent their springing under heavyblows.

f Patented March 2.o, 1566; Y

The central portion of part 10 is vextended-l upward ina cylindrical tube 22. Avplun er 23 is. providedto fit the .opening 25 in tubu ar portion 2,2 and has an elongated head 24 suit-A able for strikingwith a heavy Sledge orham- IIleI'.

The interior-.of the dividedswage has its upper portion 26`made in conical form to al` lowequal pressure toA all surfaces. part'll Yhas a cup-shaped opening '27 therein.

pound which melts at low temperature, the modeling compound used by all'l dentists supplyingthis puifpose perfectly. The conical opening 26 islled with a -waX`compound, vpreferably formed of sixteen parts paraflin to one part venice-of-turpentine or eight parts of spermaceti and paraHn-wax and one Lower Opening 27 is filled with a stiff resinous compart-of venice-of-turpentine. Either of these 1 "gives `at'ou'gh wax which forms the sheet metalfto the die without breaking the Wax under the heavy4 pressure in the swage. Ring 14 is held in upper part 10 by the waX and its.

close fit. Die 28 is made of metal which melts at low temperature, preferably at about f 150O Fahrenheit.

The operation of making a dental plate is as follows: The cup-shapedopenings 26 and l27 of the parts 10l and 11 are filled with the modeling compound and' Wax, as above stated. The samewaX and compound are used over and over in swaging plates. The opening in the waX formed by the die and plate remains about 'the same, so as to quickly' conform to the change in shape of thel different plates. lThe im ression of the mouth is taken with plaster-o -paris or modeling com ound, and this cast may be immediately ii led with the melted low-temperature metal for the die without Waiting for the cast to dry, since the metal melts at a teme perature below the boiling-point and will -not create air-bubbles from moisture. Accordingly the metal may be run into the Wet plaster-of-paris cast at once, or it may be used Ioo" IIO

in the same manner in the model compound cast without melting the cast. It is then placed in cold water, instantly setting the metal hard. The die 28 is now ready to be placed in the modeling compound in opening 27, the compound having first been softened bysetting in hot water or over a flame for a few moments. This allows the die 28 to sink into the compound to the desired point, at which point the compound may be instantly set hard by running cold water over it. This holds the die 28 firmly in place. Die 28 is placed with its front part toward the projec- -tions 31, so that the operator knows the eX- act position of his die and can open the parts of the swage from the rear side of the die, and thus not break or bend the under-cut ofthe plate. It is apparent that the die 28 being slightly above the level of the lower part 11 the under-cut of the die is accessible for malleting. The thin sheet metal 29 for the plate is placed over the die and a piece of sheetrubber 30, such as is used by dentistsfor rubber-dam work, is placed over plate 29. The upper portion 10 is now forced down upon the die and plate by means of clamps 18, which give great leverage powerin holding the parts together and preventing leakage. They also form an easy means of putting the parts together and taking apart. Plungerl 24 is then struck a number of blows with the Sledge, three blows being sufiicient to complete the plate, thereby forcing the wax in the upper part about all parts of the die and forcing the sheet metal of the plate to conform to the least depressions in the die. It is apparent that great pressure will be given by such blows to the confined die and plate, estimated at about three thousand five hundred to four thousand pounds to the square inch, sufficiently powerful to cause a plate of eighteen-gage aluminium-bronze to copy the die. Under such pressure any liability to leakage is a great detriment. A metal plate on being removed from the swage is as bright and smooth as when put in, thereby preventing the polishing away of at least two gages in thickness of the gold or other material used.

I claim as new- 1. In a dental-plate swage, a hollow base formed in two parts, a cup-shaped lower portion having a resinous compound adapted to support the die, a cup-shaped u per portion having a yielding wax compoun therein and provided with a tubular opening, a plunger operable in said opening, lugs on said )ortions and screw-clamps to engage said ings and unite said portions, and a ring Witlnn said base to protect the joint between said portions.

2. A dental-plate swage consisting of, a lower portion l 1 having the cup-shaped opening 27 on its upper side and the lugs 17 thereon, the upper portion 10 having the conical opening 26 on its under side and lugs 16 t ereon, a tubular extension 22 in said up er portion, a plunger 23 operable in said tuiiuar portion, screw-clamps 18 engaging said lugs to hold the parts together, ring 1.4 having seats within said parts adjacent the joint between said portions to prevent leakage, a die 28 supported upon a resinous compound in opening 27, a rubber covering 29 for the plate and a yieldable wax compound in opening 26, substantially as and for the purpose specified.

Tn testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

GRANT E. FREEBORN.

Witnesses:

L. J. SIZ'ER, PERCY L. HANKs. 

